A Source Travelling to the Right at a Speed of 5

A source travelling to the right at a speed of 5 m/s emits a sound wave which is reflected off a reflector travelling to the left at a speed of 5 m/s.If the frequency of the reflected sound wave detected by a listener back at the source is 100 Hz,what is the frequency of the wave emitted at the source?

A) 100 Hz
B) 106 Hz
C) 103 Hz
D) 94.3 Hz
E) 97.1 Hz

Correct Answer:

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